Пожалуйста, помогите решить быстрее:)

а) [tex]\frac{(1-sin^{2}\alpha)*(sin4\alpha-sin2\alpha) }{cos\alpha+2cos3\alpha+cos5\alpha}[/tex]

б) [tex](\frac{sin\alpha}{cos2\alpha}+\frac{cos\alpha}{sin2\alpha})*\frac{sin7\alpha+sin\alpha}{cos\alpha}[/tex]

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